Sonic tower is a good one, and any 12cm fan would cool it great. Its a ctually much lighter than it looks.
Blue orb 2 works fine for single cores.
Sonic tower is the easiest to instal, keeping the socket bracket there undo the bolts, mount the heatsink and redo the bolts, the socket brakets limits how far u can put in the bolts just the right ammount, and u dont have to use the long thermaltake instructions, which are a pain.